Stock-based Compensation (Tables)

12 Months Ended

Dec. 31, 2016

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

The following table presents the activity related to options under all plans for the years ended December 31, 2016, 2015, and 2014.



	2016				2015				2014
	Options outstanding		Weighted-average exercise price		Options outstanding		Weighted-average exercise price		Options outstanding		Weighted-average exercise price
Balance at beginning of year	3,375,909		$	5.44	85,901		$	34.85	111,571		$	38.92
Granted	14,222		3.71		3,300,000		4.79		—		—
Exercised/Released	(2,266	)	3.60		—		—		—		—
Cancelled / forfeited	(2,196	)	30.56		(8,301	)	21.14		(20,482	)	33.90
Expired	(1,697	)	209.87		(1,691	)	151.20		(5,188	)	125.83
Balance at end of year	3,383,972		$	5.32	3,375,909		$	5.44	85,901		$	34.85
Exercisable at end of year	83,972				75,909				67,404

Schedule of weighted average exercise price and weighted average remaining contractual life

Information regarding the number, weighted-average exercise price, and weighted-average remaining contractual life of options by range of exercise price at December 31, 2016 is as follows:



	Options outstanding				Exercisable options
Exercise price range	Number of options	Weighted-average exercise price		Weighted-average remaining contractual life (years)	Number of options	Weighted-average exercise price
Under $50.00	3,371,834	$	4.80	8.0	71,834	$	5.45
$80.01 - $120.00	8,831	101.30		1.2	8,831	101.30
$220.01 - $279.00	3,307	271.82		0.1	3,307	271.82
	3,383,972	$	5.32	8.0	83,972	$	26.02

Schedule of nonvested restricted stock units activity

The following table presents the activity for nonvested restricted stock for the year ended December 31, 2016:



	Number of shares		Weighted- average grant date fair value per share
Nonvested as of January 1, 2016	909,410		$	6.37
Granted	579,638		5.70
Released	(297,088	)	5.18
Canceled / forfeited	(42,985	)	4.94
Nonvested as of December 31, 2016	1,148,975		$	6.39